The document discusses fisheries and dam development in the Mekong Basin. It notes that the Mekong supports the world's largest inland fishery, providing over 2 million tonnes of fish annually, which is a critical source of food and protein for millions of people. However, the large number of proposed mainstream dams would likely block long-distance fish migrations, threatening the fisheries. A strategic environmental assessment recommended deferring decisions on mainstream dams for 10 years to study impacts, but one dam project has moved forward despite objections.